GUI to delete a printer

hello, having trouble this.  trying display list of printers , delete them using winforms.  failing. appreciated.

[system.reflection.assembly]::loadwithpartialname("system.windows.forms")  function remove-printer($printobject, [string]$printerpath)  {  	$dp = $printobject | where-object { $_.deviceid -match $printerpath}  	$dp.psbase.delete()  }    $winform = new-object windows.forms.form  $winform.text = "delete printer"  $winform.size = new-object drawing.size(400,150)    $deletebutton = new-object windows.forms.button  $deletebutton.location = new-object drawing.size(220,10)  $deletebutton.text = "delete"  $winform.controls.add($deletebutton)    $listbox = new-object windows.forms.listbox  $listbox.location = new-object drawing.size(10,10)  $listbox.size = new-object drawing.size(200,100)  $winform.controls.add($listbox)  $printers = (get-wmiobject -class win32_printer)  $printersfile = $printers | ft name -hidetableheaders  remove-item c:\_tmp\printers.txt  $printersfile > c:\_tmp\printers.txt  (get-content c:\_tmp\printers.txt) | ? {$_.trim() -ne "" } | set-content c:\_tmp\printers.txt  	foreach($i in (get-content c:\_tmp\printers.txt))  		{  			$listbox.items.add($i) | out-null  		}  $winform.add_shown($winform.activate())  $listbox.selecteditem    $deletebutton.add_click(  	{  		(get-wmiobject -q "select * win32_printer name='$listbox.selecteditem'").psbase.delete()  	}  )      $winform.showdialog()  

add @ beginning of get-printer function

$listbox.items.clear()

clear out contents of listbox prior re-adding printers.

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